@charset "utf-8";
$box-display:flex;
$font-size:12px;
body {
    background-color: #f5f5f5;
}


/* 头部 */

.header {
    position: sticky;
    top: 0;
    width: 100%;
}


/* 顶部 */

.brand-header {
    position: relative;
    background: #f5f5f5;
    height: 36px;
    width: 100%;
}

.bra-wrapper,
.nav-wrapper {
    display: $box-display;
    padding: 0 38px 0 36px;
    max-width: 1920px;
    justify-content: space-between;
}

.bra-left {
    display: $box-display;
}

.bra-right {
    align-items: center;
    display: $box-display;
    position: relative;
}

.bra-r-help {
    display: $box-display;
    align-items: center;
}

.helpdetail {
    width: 300px;
    position: absolute;
    padding-left: 20px;
    padding-top: 40px;
    padding-bottom: 40px;
    left: -300px;
    top: 22px;
    background-color: #fff;
    z-index: 100;
    font-size: $font-size;
    display: none;
}

.helpdetail li {
    padding-top: 10px;
}

.helpdetail li a {
    color: #757575;
}

.helpdetail li .helptitle {
    font-size: 16px;
    font-weight: bold;
    color: #111;
}

.bra-r-help a,
.desktoplogin a,
.desktoplogin button {
    font-size: $font-size;
    padding: 4px 8px;
    font-weight: 500
}

.desktoplogin button {
    border: none;
    cursor: pointer;
    overflow: visible;
    -webkit-tap-highlight-color: transparent;
    -webkit-appearance: none;
}

.body-4 {
    line-height: 1.33333;
}

.desktoplogin {
    display: $box-display;
    align-items: center;
}


/* 导航 */

.nav-header {
    background: #fff;
    position: relative;
    height: 60px;
    width: 100%;
    transition: transform .15s ease
}

.nav-list {
    margin: 0 auto;
    height: 60px;
    overflow: hidden;
    max-width: 1255px;
}

.nav-list li {
    display: inline-block;
    height: 100%;
    line-height: 60px;
}

.nav-list li a {
    border-bottom: 2px solid transparent;
    padding-bottom: 18px;
    transition: border-color .1s, color .1s;
    padding-right: 12px;
    padding-left: 12px;
}

.leftlogo img {
    margin-top: 20px;
}

.nav-right {
    display: $box-display;
}

.nav-search {
    background-color: #f5f5f5;
    margin: 10px 0 10px 0;
    border-radius: 25px;
    line-height: 40px;
}

.nav-search button {
    margin-left: 20px;
    font-size: 25px;
    border-radius: 100px;
}

.nav-search input {
    background-color: #f5f5f5;
}

.btngroup {
    display: $box-display;
    font-size: 30px;
    line-height: 60px;
}

.btngroup a {
    margin-left: 15px;
    margin-right: 15px;
}